Go to Messages.

Click Permissions.

Check the corresponding boxes for desired permissions.

Permissions are assigned on a role-by-role basis. For instance, to prevent a student from sending a message to "All Participants", un-check the Student Permission box located next to the option, "Allow the 'All Participants' options to the 'To' field."

Note: These options will be visible when clicking the "To" text box in Compose a Message, within the Message tool.

Use drop-down menu for separate permissions based on groups.

This option allows the user to change permissions for different groups. This way, each group has unique Message tool options.